kc3-lang/harfbuzz/src/hb-mutex-private.hh

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• Hash : a1970d9a
  Author :
  Date : 2012-02-24T13:51:09
  

  Add support for atomic int and mutex on Apple systems
  
  So, apparently there's no atomic int 'get' method on Apple.  You have to
  add(0) to get.  And that's not const-friendly.  So switch inert-object
  checking to a non-atomic get.  This, however, is safe, and a negligible
  performance boost too.
  

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• src/hb-mutex-private.hh

• /*
   * Copyright © 2007  Chris Wilson
   * Copyright © 2009,2010  Red Hat, Inc.
   * Copyright © 2011  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Contributor(s):
   *	Chris Wilson <chris@chris-wilson.co.uk>
   * Red Hat Author(s): Behdad Esfahbod
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_MUTEX_PRIVATE_HH
  #define HB_MUTEX_PRIVATE_HH
  
  #include "hb-private.hh"
  
  
  
  /* mutex */
  
  /* We need external help for these */
  
  #if !defined(HB_NO_MT) && defined(HAVE_GLIB)
  
  #include <glib.h>
  typedef GStaticMutex hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	G_STATIC_MUTEX_INIT
  #define hb_mutex_impl_init(M)	g_static_mutex_init (M)
  #define hb_mutex_impl_lock(M)	g_static_mutex_lock (M)
  #define hb_mutex_impl_unlock(M)	g_static_mutex_unlock (M)
  #define hb_mutex_impl_free(M)	g_static_mutex_free (M)
  
  #elif !defined(HB_NO_MT) && defined(_MSC_VER) || defined(__MINGW32__)
  
  #include <windows.h>
  typedef CRITICAL_SECTION hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	{ NULL, 0, 0, NULL, NULL, 0 }
  #define hb_mutex_impl_init(M)	InitializeCriticalSection (M)
  #define hb_mutex_impl_lock(M)	EnterCriticalSection (M)
  #define hb_mutex_impl_unlock(M)	LeaveCriticalSection (M)
  #define hb_mutex_impl_free(M)	DeleteCriticalSection (M)
  
  #elif !defined(HB_NO_MT) && defined(__APPLE__)
  
  #include <pthread.h>
  typedef pthread_mutex_t hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	PTHREAD_MUTEX_INITIALIZER
  #define hb_mutex_impl_init(M)	pthread_mutex_init (M, NULL)
  #define hb_mutex_impl_lock(M)	pthread_mutex_lock (M)
  #define hb_mutex_impl_unlock(M)	pthread_mutex_unlock (M)
  #define hb_mutex_impl_free(M)	pthread_mutex_destroy (M)
  
  #else
  
  #define HB_MUTEX_IMPL_NIL 1
  typedef volatile int hb_mutex_impl_t;
  #define HB_MUTEX_IMPL_INIT	0
  #define hb_mutex_impl_init(M)	((void) (*(M) = 0))
  #define hb_mutex_impl_lock(M)	((void) (*(M) = 1))
  #define hb_mutex_impl_unlock(M)	((void) (*(M) = 0))
  #define hb_mutex_impl_free(M)	((void) (*(M) = 2))
  
  #endif
  
  
  struct hb_mutex_t
  {
    hb_mutex_impl_t m;
  
    inline void init   (void) { hb_mutex_impl_init   (&m); }
    inline void lock   (void) { hb_mutex_impl_lock   (&m); }
    inline void unlock (void) { hb_mutex_impl_unlock (&m); }
    inline void free   (void) { hb_mutex_impl_free   (&m); }
  };
  
  #define HB_MUTEX_INIT		{HB_MUTEX_IMPL_INIT}
  #define hb_mutex_init(M)	(M)->init ()
  #define hb_mutex_lock(M)	(M)->lock ()
  #define hb_mutex_unlock(M)	(M)->unlock ()
  #define hb_mutex_free(M)	(M)->free ()
  
  
  struct hb_static_mutex_t : hb_mutex_t
  {
    hb_static_mutex_t (void)  { this->init (); }
    ~hb_static_mutex_t (void) { this->free (); }
  
    private:
    NO_COPY (hb_static_mutex_t);
  };
  
  
  
  #endif /* HB_MUTEX_PRIVATE_HH */
  

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